Rock-drill.



E. M. MAGKIE a. P. P. DOYLB.

Patented. July 26, '1910.

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ROOK DRILL.l APPLICATION FILED JAN. 19,

E. M. MACKIE & P. F. DOYLE.

* :110011 DRILL. PPLIoA'rIbN' FILED 11111 1 '1m Patented Ju1y 26, 1910.

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` for efective work, to increase the drilling or with the air which theoperators have to 4a pump in pumping ROCK-DRILL 965,474. Specificationof Letters' Patent.

Application :filed January 19, 1909. Serial No.

To all whom 'it may concern: f'

Be it known that we, EDWIN M. MACKIE and PERcivAL F. Dorm, both residingat Franklin, Venango count Pennsylvania,

our invention; Fig.' 2 a front elevation thereof; Fig. 3 a section onthe irregular line 3`3 of Fig. 1; Fig. 4 an elevation of the rearportion of the drill piston and a part the forme-r being a citizen ofthe United of the rifle bar, the same being on a larger States and thelatter 2 Clt'lZGIl 0f the D O- scale than the preceding figures; Fig. 5a minion of Canada, have invented certain @goss-Section 0n the line 5 5of Fig 4; Fig,-

new and useful Improvements in Rock- Drills, of which the following isaspecication.

Our invention relates to rock drills and the object thereof is ,toprovide novel and efficient means incorporated therein for supplyingwater or air and water to the drill steel, the fluid being dischargedthrough such drill steel for several purposes as for instance tothoroughly clean the hole of cuttings, to keep the cutting end of thesteel coolthereby enabling Iit to ret-ain its temper and so keep itscutting edges in condition 6 a slde elevation of one of the' packingrings Fig. 7 an edge elevation of suchpackmg ring with a portionthereof. broken away; and Fig. 8 a detail of a modification.

Referring to the present embodiment of our invention as illustrated inthe drawings, the rock drill elements are for the most part of the usualandwell-known construction so that it will be necessary to refer only tothose parts-thereof which are directly con` cerned or affected bythe'incorporatin'g of our invention therein.'

Referring to Fig. 1 the cylinder lis provided with the usual pistonchamber within 'which reciprocates the piston 2 having at its front endcarrying at its outer end a chuck 4 containing-a suitable bushing 5.As'usual the rear end of the piston is provided with a central bore 6 toreceive the rifle or rotating bar A7 adapted to coperate with the riiiebar nut 8 screwing into a counterblore in said central bore 'o r chamber6 of the piston. The eX- treme rear end of the iston is provided withsuitable packing-1n the present instance a cupleather packing 9beingemployed together with a packing retainer 10 screwing upon thereduced diameter of the rifle bar 4nut as clearly indicated in Fig. 4.The riiie bar coperates in the usual manner cutting powerof the machineby enabling the cutting end of the steel to strike on a clean freshsurface at leach blow7 to keep the hole free. from mud 7. thereby makingthe rotative eort easier and-so increasing the speed ofthe machine, andalso to prevent dust or grit from the drilling mixing breathe, therebysaving them from the danger of contracting what is known as minl ers7phthisis. In practice we provide for both an intermittent iiuid serviceor a oo ntinuous uid service and also provide for the mixture of thefluids referred to or the use ofeither one of such fluids although it ispreferred to' employ Water either alone or mixed/With airvexcept wherethe supply is scarce in which event air alone may-- be em,-I` ployed.

In the preferred embodiment of our inratchet slip ring 12, said latterparts being held in place by means of the upper or backliead 13. Thisback-head is provided Wit-h a 4cent-ral bore within which iserrangedilexible packing 14 for packing an extension of the rifle bar ashereinafter explained, such packing being provided with an adjustingring 15 screwing into said bore. At the extreme rear end of the backheadand in communication with said bore-is formed a chamber 16 by mea-ns ofa cap 17. vThe back-head 13 is provided with a supply passage 18communicatin with the chamber 16 for supplying the uid through asultable inlet pipe 19 to the drill steel in the manner hereinafterdescribed and the cylinand arrangement is such that the rock drillingmechanism forms a cooperative part of the Huid service and servessubstantially as the fluid through the drilling'mechanismend through thedrill steel to the hole in which such steel is performing its Work. Thevarious featuresof novelty and utility in our Construction will beapparent from the" description hereinafter given..

In the drawings Figure 1 is a central longitudinal section of a .rockdrill embodying the piston rod or chuck rod 3` with a thrust ring 11-and also the usual.

Patented Jury 26,1910'.

vided towardits front with the usual .operating for admitting andrefluid to and from oprler is provided ports' and passages`20 leasingthe operating posite ends of reciprocating the same, such passages beingcontrolled by the main valve 21 which is.op-. erated'by the rocker 22 inthe lusual and well-known manner. y

The 'piston'rod or chuck rod 3 is' provided with a cent1-al fluidpassage 23 adapted to communicate at. its spending central passage 24 inthe drill' steel 25. As shown in Fig. 1 suitable packing 26 is arrangedat therear end of the drill steel and interposed between the bushing -5and the bottom of the socket formed in the front end 'of the chuck rod.`The piston 2 is prowith apacking 27 which in practice is a piston ringof leather. Between therifle bar and the inner walls of the chamber 6 isinterposed a suitable pack-l ing 28 which by reason of the peculiarformitted froni'the supply pipe of the drill steel. .55

. taining ring 29.

- provided mation of th'erifle bar is correspondingly fluted -or riflcd.This packing-is of the cu leather type and as indicated' in the enlargeview, Fig. 4, the same is provided with a re- T his packing 28 isadapted to permit the fluid admitted back of the pistontopass byitbetween the rifle bar and the' walls of the chamber 6 and to enter thefront end of such chamber when the pressure therein is less than thepressure behind the piston,'but to prevent the flow of fluid in theopposite dii'ection.

-In the present instance' the rifle bar has'a rearward extension 30'which extends into the cential bore yin the baclchead 18 which extensionas well as the entire lfriiie bar is with a fluid passage 31. Thisextension. of the rifle bar is packed by means of the packing 1 4hereinbefore lreferred to.

#Likewise the .ratchet ring 11` may be pro- For an intermittent serviceof water and air, water under suitable pressure is adany suitable valvemechanism not shown) to the chamber 16 from whence the water will flowthrough the passage 31 in the rifle bar to the rifle bar' chamber 6,thence through the passage 23 in the chuck rod and through the passage24 to the front end Thus a communication is established for the passageof the fluid under pressure from the fluid passage 18 in the back-headto the front end of the drill steel, the -working parts of the drillthrough which the fluid passes being adequately and efliciently packedfor the prevention of leakage of the fluid. Y

When the drill is in operation and with the water under pressureadmitted to the back-head in the manner already explained,

the piston for the-purpose of and inasmuch as front end withI a corre-v`the -force to clean the hole.

19 (through steel becoming plugged up tlie sizeof the chamber 6 infrontof the rifle bar willbe increased. upon the outward stroke of thepiston and the size of the fluid ports is such 'that such space will beincrease-d faster than the fluid can fill it. "As a result the pressurein the chamber 6 will be reduced theinner or rear end of the pistonchamber is filled with the operating fluid under a greaterl pressurethan the reduced pressure in the chamber 6,-.aportion of the formerpressure will pass bythe packing 28 which acts as a sort ofacheckf'valve permitting a such pressure to pass forwardly along thewallsof the chamber G, but preventing tlie return thereof, Thereupon onthe `inward s-troke of the piston, the chamber space in front oftheyrifle bar'will be decreased and the pressure of the fluid thereinwill'be increasedby the continued rearward movement of the piston in theregular operation of the drill. is aV mixture of water and air inasmuchas the operating fluid of the drill is usually air, will be expelledforcibly through the passages 23 and 24 to the front end of the drillsteel 25 and into the hole in whichthe steel is drilling, therebycleaning out'- such hole with the attendant advantages hereinbeforerecited.

For continuous water and air service, the' action will be the same, onlyinstead of water alone being allowed to enter the supply pas 'sage 18,the greater portion of the fluid will be air, onlyenough water beingmixed with it to prevent dust while the air will supply This method isto be used where the supply of water is scarce` By preference thepacking ring 27 is made in two pieces as detailed in Figs. 6 and 7, suchpacking comprising the leather packing proper 27 which is kept incontact ,with the inner Walls of the piston chamber by a circular steelspring 27a, which construction of ring efficiently seals against4leakage while on account of its absorbent qualities the leather becomessaturated with oil and so acts as a distributer of lubrication along itspath in the cylinder 1.

The construction and arrangement described as well as thel freedom ofthepassages yto the drill steel are such thatno appreciable or detrimentalback pressure is'created in practice but if desired a check valve As aresult the fluid whichmightl be interposed at" any suitable point as4rie bar chamber, a rifle bar therein, the

therein having at one `enter the rifle bar chamber but lliovvv in' theopposite pressure in the rie bar chamber which would eventually s to'pthe machine andv posg sibiy burst the packings.4

" e claim:

l. In a rock drill, the combination of a cylinder having a pistonchamber, a piston therein havin A. at one end a bore forming a rie barcham er, a riile bar o erating therein, the piston being provide with alonnitudinal passage `for lnid, and means ihr permitting' the workingfluid to enter said passage from the piston chamber but preventing theflow in the opposite direction.

2. In a rock drill, the combination ofa cylinder having a pistonchamber, a piston therein having at one end a bore forming a pistonVbeing provided with a passage for ind,.packing Abetween such bar andpiston permitting passage of pressure fluid from-the piston chamber tothe rifle bar chamber and to the passage in the piston but preventingHow in the opposite direction, whereby the movement of the piston willcause forcible ejec-4 tion of Huid at the front end of the drill.

3. In a rockdrill, the combination of al cylinder having a pistonchamber, a piston end a bore forming a rifle bar chamber', al rile bartherein, said bar and piston'having communicating Huid passages adaptedto communicate with .a source of fluid, and means 'for permitting thepressure duid from the piston .chamber to preventing direction.

4. In a rock'drill, the combination of a cylinder having a pistonchamber, a piston therein having at one end a bore forming a rile barchamber, a rilebar therein, said bar and piston having c^mmnnicatingHuid passages adapted to communicate with a source of fluid, and a utedcup packing interposed between the rifle bar and the piston.

5. In ya rock drill, the combination of a cylinder having a pistonchamber, a piston therein having at one end a bore forming a rifle barchamber, a rifle bar therein, said bar and piston having communicatingfluid passages adapted to communicate With a source of fluid, a lutedcup packing inter'-4 posed between the rifle bar and the piston, and aretaining rin 29 for such packing.

6. In a rock dri the combination of a cylinder having a piston chamber,a piston therein having at one end a: bore forming a rifle bar chamber,a rifle bar therein, said bar and piston having communicating fluidpassages adapted to communicate with a source of fluid, a fluted cuppacking interposed between the rifle bar and the piston, a thrust ring1l ,for the rear end of said rifle bar and packing 32' to preventleakage.

7. In a rock drill, the combination of a cylinder having apistonchamber, a piston therein having at one end a bore forming a rifiebar chamber,

passages adapted to communicate with a source of Huid, said riile barhaving a rearward extension, a head in whichthe'latter is mounted,packing for the extension, and packing between therilie bar and piston.

EDVIN M. MACKIE;v PERCIVAL F. DOYLE Witnesses: GRACE T. HOPKINS J, B.WILLIAMS.

a rifle bar therein, said l' bar and piston having communicating fluid

